Roger Federer (2003-2010)

JOE KLAMAR, AFP/Getty Images

The Swiss men's tennis player made his first major splash by winning Wimbledon in 2003 and has gone on two win a record 16 Grand Slam titles, including a career Grand Slam. He held the No. 1 world ranking for a record 237 weeks from the end of 2005 through the 2010 French Open.

The Swiss men's tennis player made his first major splash by winning Wimbledon in 2003 and has gone on two win a record 16 Grand Slam titles, including a career Grand Slam. He held the No. 1 world ranking for a record 237 weeks from the end of 2005 through the 2010 French Open. (JOE KLAMAR, AFP/Getty Images)

The Swiss men's tennis player made his first major splash by winning Wimbledon in 2003 and has gone on two win a record 16 Grand Slam titles, including a career Grand Slam. He held the No. 1 world ranking for a record 237 weeks from the end of 2005 through the 2010 French Open.